META
160 knots,
If you use a bit of common sense you will do ok. There were a number of instructors in the past, on obtaining their B Grade, obtained Twin Training Approval. They had no charter experience and not only were they successfull they went on to get airline positions. I also know of at least three very "experienced" instructors who were killed failing engines just after lift off by cutting the mixture and one trying to explore the Vmca limits.
Frankly if you have 5000 hours and still sitting in GA, well then one has to promote the experience bit, but it has been proven many times over the years that with knowledge gained from knowing the theory and not by experimentation, you can safely do a good job.
If after 3000 hours there is still no likely hood of an airline slot in Aust. go overseas.
Best of luck.